JP2001325981A - Processed gas reforming mechanism, solid polymer fuel cell system, and processed gas reforming method - Google Patents
Processed gas reforming mechanism, solid polymer fuel cell system, and processed gas reforming methodInfo
- Publication number
- JP2001325981A JP2001325981A JP2000141111A JP2000141111A JP2001325981A JP 2001325981 A JP2001325981 A JP 2001325981A JP 2000141111 A JP2000141111 A JP 2000141111A JP 2000141111 A JP2000141111 A JP 2000141111A JP 2001325981 A JP2001325981 A JP 2001325981A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- gas reforming
- fuel cell
- reforming
- polymer electrolyte
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Fuel Cell (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は被処理ガス改質機構
と固体高分子型燃料電池システム並びに被処理ガス改質
方法に関し、詳しくは、都市ガス等の被処理ガスを改質
してこれを固体高分子型燃料電池などに供給可能な被処
理ガス改質機構と、これを備えた固体高分子型燃料電池
システム並びに被処理ガス改質方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process gas reforming mechanism, a polymer electrolyte fuel cell system, and a process gas reforming method. The present invention relates to a target gas reforming mechanism that can be supplied to a polymer electrolyte fuel cell and the like, a solid polymer fuel cell system including the same, and a target gas reforming method.
【０００２】[0002]
【従来の技術】固体高分子型燃料電池は、各種燃料電池
のなかでも、近時、その使用し易さから、注目を集めて
おり、実用化が期待されている。すなわち、固体高分子
型燃料電池は作動温度が（１）７０〜８０℃で取り扱い
易く、（２）起動・停止がリン酸型、溶融炭酸塩型、固
体電解質型の燃料電池に比べて容易であり、（３）出力
密度が高い、（４）軽量・コンパクトである、（５）電
解質が高分子膜でできているため、反応ガスの差圧に耐
え、作動中に電解質の流出がないのでメンテナンスが不
要、などの利点がある。そのため、小型発電装置、小型
コージェネレーション装置として、更には低公害の電気
自動車などの移動用電源として活用が期待されている。2. Description of the Related Art Among various types of fuel cells, polymer electrolyte fuel cells have recently attracted attention due to their ease of use and are expected to be put to practical use. That is, the polymer electrolyte fuel cell has an operating temperature of (1) 70-80 ° C. and is easy to handle, and (2) start / stop is easier than the phosphoric acid type, molten carbonate type and solid electrolyte type fuel cells. Yes, (3) High power density, (4) Light weight and compact, (5) Since the electrolyte is made of a polymer membrane, it can withstand the differential pressure of the reaction gas and there is no outflow of the electrolyte during operation. There are advantages such as no need for maintenance. Therefore, it is expected to be used as a small power generation device, a small cogeneration device, and a mobile power source for low-pollution electric vehicles.
【０００３】そして、固体高分子型燃料電池に供給する
燃料として、一般に都市ガスを利用し、都市ガスから、
その水蒸気改質反応などにより生成された水素を用いる
ようにしている。[0003] In general, city gas is used as fuel to be supplied to the polymer electrolyte fuel cell.
Hydrogen generated by the steam reforming reaction or the like is used.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、水蒸気
改質反応などにより都市ガスから燃料の水素を生成する
場合、都市ガスには付臭剤（ジメチルスルファイド；３
ｍｇ−Ｓ／ｍ3 （Ｎｏｒｍａｌ）、ｔ−ブチルメルカプ
タン；２ｍｇ−Ｓ／ｍ3 （Ｎｏｒｍａｌ））が含まれて
おり、付臭剤における微量有機Ｓ分が後述する水蒸気改
質触媒を劣化させるため、微量有機Ｓ分を除去する必要
がある。ところが、付臭剤は物理化学的に安定であり、
吸着剤にも吸着し難い性質を有しているため、付臭剤を
含む都市ガス中の有機Ｓ分は除去し難い。そこで、脱硫
法としては、Ｃｏ−Ｍｏ系あるいはＮｉ−Ｍｏ系触媒を
用いると共に、水素を導入して行う水添分解した後、更
に生成した硫化水素を酸化亜鉛で吸着して除去する水添
脱硫法が採られる。しかし、この水添脱硫法は、別に水
素源を設ける必要があり、装置全体が複雑で大掛かりと
なるのみならず、水添脱硫法によっても水蒸気改質触媒
の劣化を防止するには十分ではない場合が多く、例えば
ＮｉやＲｕ触媒はｐｐｍ以下の低濃度のＳ分でもその表
面に硫化物を形成し、触媒表面をほとんど覆ってしまう
ので、劣化を確実に防止するには複雑で大掛かりな設備
を要しているのが現状である。However, when hydrogen as fuel is produced from city gas by a steam reforming reaction or the like, an odorant (dimethyl sulfide; 3) is added to the city gas.
mg-S / m 3 (Normal), t-butyl mercaptan; 2 mg-S / m 3 (Normal)), because trace organic S in the odorant deteriorates the steam reforming catalyst described later. It is necessary to remove a trace amount of organic S. However, odorants are physically and chemically stable,
The organic S component in the city gas containing the odorant is difficult to remove because it has a property that it is not easily adsorbed by the adsorbent. Therefore, as the desulfurization method, a Co-Mo-based or Ni-Mo-based catalyst is used, and after hydrogenolysis is performed by introducing hydrogen, the generated hydrogen sulfide is further adsorbed and removed by zinc oxide. Law is adopted. However, in this hydrodesulfurization method, it is necessary to provide a hydrogen source separately, and not only is the entire apparatus complicated and large-scale, but also the hydrodesulfurization method is not enough to prevent the deterioration of the steam reforming catalyst. In many cases, for example, Ni and Ru catalysts form sulfides on the surface even at a low concentration of S of less than ppm and almost cover the catalyst surface. Therefore, complicated and large-scale equipment is required to reliably prevent deterioration. Is the current situation.
【０００５】更に、固体高分子型燃料電池に使用されて
いる触媒の性能を維持するため、改質ガス中のＣＯ濃度
を低く押さえる（１０ｐｐｍ以下）必要がある。つま
り、ＣＯ被毒による白金触媒活性の劣化は低温ほど著し
いので、固体高分子型燃料電池のような低温作動型の場
合には特にその影響が大きく、ＣＯ濃度は１０ｐｐｍ以
下に押さえる必要がある。そこで、改質ガス中のＣＯ濃
度を低く押さえるため、脱硫された都市ガスに対して水
蒸気改質触媒の存在下で、約７００〜８５０℃の水蒸気
と接触させてＨ2 とＣＯに改質し、これを４００℃前後
に調整されたＦｅ−ＣｒやＦｅ−Ｃｒ−Ｃｕ触媒を充填
した高温シフトコンバータ、更に２００℃前後に調整さ
れたＺｎ−Ｃｕ触媒を充填した低温シフトコンバータに
導入する。ここで、ＣＯをＨ2 Ｏ（水蒸気）によりＨ2
とＣＯ2 に改質して、ＣＯの低減化を図るようにしてい
る。シフトコンバータを通って、更にＣＯを下げるため
にＰｔ−Ａｌ2 Ｏ3 ，Ｒｕ−Ｐｔ−Ａｌ2 Ｏ3 触媒を充
填したＣＯ除去器に導入され、供給される空気とＣＯが
選択酸化反応をし、更なるＣＯの低減化を図るようにし
ている。これらの構成のため、複雑で大掛かりな設備と
なる。Furthermore, in order to maintain the performance of the catalyst used in the polymer electrolyte fuel cell, it is necessary to keep the CO concentration in the reformed gas low (10 ppm or less). That is, since the deterioration of the platinum catalyst activity due to CO poisoning is remarkable at lower temperatures, the effect is particularly large in a low-temperature operation type such as a polymer electrolyte fuel cell, and the CO concentration needs to be suppressed to 10 ppm or less. Then, in order to keep the CO concentration in the reformed gas low, the desulfurized city gas is brought into contact with steam at about 700 to 850 ° C. in the presence of a steam reforming catalyst to reform it into H 2 and CO. This is introduced into a high-temperature shift converter filled with an Fe-Cr or Fe-Cr-Cu catalyst adjusted to about 400 ° C and a low-temperature shift converter filled with a Zn-Cu catalyst adjusted to about 200 ° C. Here, H 2 by the CO H 2 O (steam)
And CO 2 to reduce CO. Through the shift converter, is introduced into the Pt-Al 2 O 3, Ru -Pt-Al 2 O 3 catalyst was loaded was CO remover to further reduce the CO, air and CO to be supplied to the selective oxidation reaction , To further reduce CO. These configurations result in complicated and large-scale equipment.
【０００６】このように、従来の技術では複雑で大掛か
りな付帯設備を設置するのにかなりのコストを要し、固
体高分子型燃料電池を利用するシステムの製造コストの
高騰を招き、実用化の障害にもなっていた。[0006] As described above, the conventional technology requires considerable cost to install complicated and large-scale auxiliary equipment, invites a rise in the manufacturing cost of a system using a polymer electrolyte fuel cell, and is not practical. It was also an obstacle.
【０００７】そこで、本発明の目的は、比較的低コスト
で固体高分子型燃料電池などに供給する被処理ガス中の
Ｓ分を効果的に低減化すると共に、改質ガス中のＣＯを
効果的に低減化可能な被処理ガス改質機構と固体高分子
型燃料電池システム並びに被処理ガス改質方法を提供す
ることにある。Accordingly, an object of the present invention is to effectively reduce the S content in the gas to be treated supplied to a polymer electrolyte fuel cell or the like at a relatively low cost and to reduce the CO in the reformed gas. It is an object of the present invention to provide a target gas reforming mechanism, a polymer electrolyte fuel cell system, and a target gas reforming method which can be reduced in number.
【０００８】[0008]
【課題を解決するための手段】上記目的は各請求項記載
の発明により達成される。すなわち、本発明に係る被処
理ガス改質機構の特徴構成は、固体高分子電解質膜を備
えた電解セルと、この電解セルに水を供給する手段と、
前記電解セルにより電解されて生成した水素および酸素
を個別に排出して被処理ガス改質ラインに供給可能な排
出手段とを有することにある。The above object is achieved by the invention described in each claim. That is, the characteristic configuration of the target gas reforming mechanism according to the present invention includes an electrolytic cell having a solid polymer electrolyte membrane, a unit for supplying water to the electrolytic cell,
Discharge means capable of separately discharging hydrogen and oxygen generated by electrolysis by the electrolysis cell and supplying the hydrogen and oxygen to the target gas reforming line.
【０００９】この構成によれば、固体高分子電解質膜を
備えた電解セルの水分解によって生成した水素と酸素を
利用するため、装置全体を小さいものにできると共に、
装置そのものが比較的簡素な構成でよく、ことさら複雑
で大掛かりな設備を必要とすることなく、水素供給によ
り被処理ガス中のＳ分を効果的に低減化すると共に、酸
素供給により改質ガス中のＣＯを効果的に低減化するこ
とができる。しかも、水素と酸素の生成を電解で行うた
め、制御が容易で確実であり調整が行い易く、被処理ガ
ス中のＣＯの低減化に対する負荷変動への追随性が良好
であるという利点を有する。更に、固体高分子型燃料電
池を構成する固体電解質膜は、所定性能を発揮するため
には乾燥するのを確実に防止する必要性があり、そのた
め厳しい湿度管理を要するが、本発明の被処理ガス改質
機構を固体高分子型燃料電池システムに使用する場合
は、生成される酸素が水分を多量に含んだものであるた
め、その水分管理が極めて容易となる。According to this configuration, since the hydrogen and oxygen generated by the water splitting of the electrolytic cell having the solid polymer electrolyte membrane are used, the whole apparatus can be made small,
The apparatus itself may have a relatively simple configuration, and the S content in the gas to be treated can be effectively reduced by supplying hydrogen, and the reformed gas can be effectively supplied by supplying oxygen without requiring any complicated and large-scale equipment. Can be effectively reduced. In addition, since the generation of hydrogen and oxygen is performed by electrolysis, there is an advantage that control is easy and reliable, adjustment is easy, and follow-up to load fluctuation with respect to reduction of CO in the gas to be processed is good. Further, the solid electrolyte membrane constituting the polymer electrolyte fuel cell needs to be surely prevented from drying in order to exhibit a predetermined performance, and therefore strict humidity control is required. When the gas reforming mechanism is used in a polymer electrolyte fuel cell system, the generated oxygen contains a large amount of moisture, so that the management of the moisture becomes extremely easy.
【００１０】その結果、本発明によれば、比較的低コス
トで固体高分子型燃料電池などに供給する被処理ガス中
のＳ分を効果的に低減化すると共に、改質ガス中のＣＯ
を効果的に低減化可能な被処理ガス改質機構を提供する
ことができた。As a result, according to the present invention, the S content in the gas to be treated, which is supplied to a polymer electrolyte fuel cell or the like at a relatively low cost, can be effectively reduced, and the CO content in the reformed gas can be reduced.
Thus, it is possible to provide a target gas reforming mechanism capable of effectively reducing the gas.
【００１１】前記水素を排出する排出手段が、前記被処
理ガス改質ラインを構成する脱硫機構に導入されるよう
になっていると共に、前記酸素が前記被処理ガス改質ラ
インを構成するＣＯ除去器に導入されるようになってい
ることが好ましい。[0011] The discharge means for discharging the hydrogen is introduced into a desulfurization mechanism constituting the gas-to-be-treated reforming line, and the oxygen is used for removing CO constituting the gas-to-be-treated reforming line. Preferably, it is adapted to be introduced into the vessel.
【００１２】この構成によれば、比較的小規模の脱硫機
構とＣＯ除去器を使用でき、一層確実に被処理ガス中の
Ｓ分を効果的に低減化すると共に、改質ガス中のＣＯを
一層効果的に低減化することができて都合がよい。According to this configuration, a relatively small-scale desulfurization mechanism and a CO remover can be used, the S content in the gas to be treated can be reduced more effectively, and the CO in the reformed gas can be reduced. It is convenient that the reduction can be achieved more effectively.
【００１３】又、本発明に係る固体高分子型燃料電池シ
ステムの特徴構成は、請求項１又は２の被処理ガス改質
機構を備えることにある。Further, a characteristic configuration of the polymer electrolyte fuel cell system according to the present invention resides in that it comprises a gas reforming mechanism for processing gas according to claim 1 or 2.
【００１４】この構成によれば、比較的低コストで固体
高分子型燃料電池などに供給する被処理ガス中のＳ分を
効果的に低減化すると共に、改質ガス中のＣＯを効果的
に低減化可能な固体高分子型燃料電池システムを提供す
ることができる。According to this structure, the S content in the gas to be treated supplied to the polymer electrolyte fuel cell or the like at a relatively low cost can be effectively reduced, and the CO in the reformed gas can be effectively reduced. A polymer electrolyte fuel cell system that can be reduced can be provided.
【００１５】更に又、本発明に係る被処理ガス改質方法
の特徴構成は、固体高分子電解質膜を備えた電解セルに
水を供給し、この電解セルに通電して水素および酸素を
生成し、これら生成された水素および酸素を個別に排出
して被処理ガス改質ラインに供給することにある。Further, the characteristic structure of the process gas reforming method according to the present invention is characterized in that water is supplied to an electrolytic cell provided with a solid polymer electrolyte membrane, and electricity is supplied to the electrolytic cell to generate hydrogen and oxygen. It is another object of the present invention to separately discharge the generated hydrogen and oxygen and supply them to the gas reforming line to be treated.
【００１６】この構成によれば、固体高分子電解質膜を
備えた電解セルの水分解によって生成した水素と酸素を
利用するため、小型かつ簡素な装置を用いることがで
き、ことさら複雑で大掛かりな設備を必要とすることが
ないので、比較的低コストで、水素供給により被処理ガ
ス中のＳ分を効果的に低減化すると共に、酸素供給によ
り改質ガス中のＣＯを効果的に低減化することができ
る。According to this configuration, since hydrogen and oxygen generated by the water splitting of the electrolytic cell provided with the solid polymer electrolyte membrane are used, a small and simple apparatus can be used, and further complicated and large-scale equipment is used. Is not required, so that the S content in the gas to be treated is effectively reduced by supplying hydrogen and the CO in the reformed gas is effectively reduced by supplying oxygen at a relatively low cost. be able to.
【００１７】生成した前記水素を、前記被処理ガス改質
ラインを構成する脱硫機構に導入すると共に、生成した
前記酸素を、前記被処理ガス改質ラインを構成するＣＯ
除去器に導入するようになっていることが好ましい。The generated hydrogen is introduced into a desulfurization mechanism that constitutes the processing gas reforming line, and the generated oxygen is converted into CO 2 that forms the processing gas reforming line.
Preferably, it is adapted to be introduced into a remover.
【００１８】この構成によれば、比較的小規模の脱硫機
構とＣＯ除去器を使用して被処理ガスを改質でき、一層
確実に被処理ガス中のＳ分を効果的に低減化すると共
に、改質ガス中のＣＯを一層効果的に低減化することが
できる。According to this configuration, the gas to be treated can be reformed by using a relatively small-scale desulfurization mechanism and a CO remover, and the S content in the gas to be treated can be more effectively reduced more effectively. In addition, CO in the reformed gas can be more effectively reduced.
【００１９】[0019]
【発明の実施の形態】本発明の実施の形態を、図面を参
照して詳細に説明する。図１は、本実施形態の固体高分
子型燃料電池システム（以下、単に「燃料電池システ
ム」ということがある）の概略構造を示す。この燃料電
池システムは、固体高分子型燃料電池Ｃに燃料ガスとし
ての都市ガスを燃料極に供給すると共に、空気極に空気
を供給することにより電力を出力するようになってい
る。都市ガス供給の途中には、被処理ガスである都市ガ
スに含まれるＳ分を低減化する共に、ＣＯを低減化する
ための脱硫器やＣＯ変成器などからなる被処理ガス改質
ラインが設けられている。Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic structure of a polymer electrolyte fuel cell system (hereinafter, may be simply referred to as “fuel cell system”) of the present embodiment. In this fuel cell system, city gas as a fuel gas is supplied to the polymer electrolyte fuel cell C to the fuel electrode, and power is output by supplying air to the air electrode. In the middle of the supply of city gas, a gas to be treated reforming line consisting of a desulfurizer and a CO converter is installed to reduce the S content in the city gas, which is the gas to be treated, and to reduce CO. Have been.
【００２０】本実施形態では、更に、被処理ガス改質ラ
インの途中に、都市ガス中のＳ分とＣＯを効果的に低減
化する被処理ガス改質機構が接続されて構成されてい
る。この被処理ガス改質機構は、固体高分子電解質膜Ｐ
を備えた電解セル１を備えていて、この電解セル１に水
供給手段（図示略）から水を供給し、ここで水を酸素と
水素に電解するようになっている。つまり、固体高分子
型燃料電池の逆反応を生起させるのである。図番Ｅは、
電解セル１に電力を供給する直流電源であり、この直流
電源Ｅを制御することにより、生成する水素や酸素の量
を容易に調整することがてきる。又、固体高分子電解質
膜Ｐとしては、フッ素樹脂系スルホン酸膜などの高分子
膜を使用できる。In this embodiment, a processing gas reforming mechanism for effectively reducing S content and CO in city gas is connected in the middle of the processing gas reforming line. The mechanism for reforming the gas to be treated is a solid polymer electrolyte membrane P
Is provided with water from a water supply means (not shown), and the water is electrolyzed into oxygen and hydrogen. That is, the reverse reaction of the polymer electrolyte fuel cell is caused. Figure E is
This is a DC power supply that supplies power to the electrolytic cell 1, and by controlling the DC power supply E, the amount of generated hydrogen and oxygen can be easily adjusted. Further, as the solid polymer electrolyte membrane P, a polymer membrane such as a fluororesin sulfonic acid membrane can be used.
【００２１】電解セル１によって生成された水素は、水
素排出手段である配管２ａを通して都市ガス供給路に導
入されるようになっている。都市ガスは水添脱硫器３に
導入され、ここで都市ガス中に含まれる有機Ｓ分をＣｏ
−Ｍｏ系触媒やＮｉ−Ｍｏ系触媒を用いて、電解セル１
から生成された水素を導入することにより、都市ガス中
に含まれる有機Ｓ分を水添分解し、生成する硫化水素を
酸化亜鉛に吸着させる機能を有して、都市ガス中の有機
Ｓ分を顕著に低減化できることになる。The hydrogen generated by the electrolytic cell 1 is introduced into a city gas supply passage through a pipe 2a which is a hydrogen discharging means. The city gas is introduced into the hydrodesulfurizer 3, where the organic S content contained in the city gas is reduced to Co.
-Electrolysis cell 1 using Mo-based catalyst or Ni-Mo-based catalyst
By introducing the hydrogen generated from the above, the organic S component contained in the city gas is hydrolyzed and has a function of adsorbing the generated hydrogen sulfide to zinc oxide. It can be significantly reduced.
【００２２】更に、水添脱硫器３で有機Ｓ分を低減化さ
れた都市ガスは、活性炭あるいはモレキュラーシーブス
等の吸着剤を備えて構成される吸着型脱硫器４に導入さ
れ、ここで有機Ｓ分は一層顕著に低減化される。もっと
も、高性能吸着型脱硫器を用いる場合には、水添脱硫器
３は必ずしも必要ではなく、吸着型脱硫器４に導入して
もよいが、吸着型脱硫器４の前段階に水添脱硫器３を設
けておくと、それだけ吸着型脱硫器４の負荷が軽減され
るため、吸着型脱硫器４中の吸着剤の再生あるいは更新
期間を長くすることができて好ましい。Further, the city gas whose organic S content has been reduced by the hydrodesulfurizer 3 is introduced into an adsorptive desulfurizer 4 comprising an adsorbent such as activated carbon or molecular sieves. The minutes are significantly reduced. However, when a high-performance adsorptive desulfurizer is used, the hydrodesulfurizer 3 is not always necessary, and may be introduced into the adsorptive desulfurizer 4, but the hydrodesulfurizer is provided before the adsorptive desulfurizer 4. The provision of the reactor 3 is preferable because the load on the adsorptive desulfurizer 4 can be reduced correspondingly, and the regeneration or renewal period of the adsorbent in the adsorptive desulfurizer 4 can be lengthened.
【００２３】これら脱硫機構３，４により有機Ｓ分を十
分に低減化された都市ガスは、水蒸気改質器５に導入さ
れ、ここでは、スチーム／カーボン比＝２〜３．５に調
節されて、７００〜８５０℃に加熱され、ＣＯ濃度は１
０数％である。The city gas whose organic S content has been sufficiently reduced by the desulfurization mechanisms 3 and 4 is introduced into the steam reformer 5, where the steam / carbon ratio is adjusted to 2 to 3.5. Is heated to 700 to 850 ° C. and the CO concentration is 1
0%.
【００２４】次に、改質された都市ガスはＣＯ変成器６
に送給される。このＣＯ変成器６は、高温シフト反応用
変成器６ａと低温シフト反応用変成器６ｂに２段階構成
となっている。高温シフト反応用変成器６ａには触媒と
して３００〜５００℃に加熱されたＦｅ−Ｃｒ系あるい
はＦｅ−Ｃｒ−Ｃｕ系のものが用いられていて、ここで
ＣＯ濃度を１０数％から約２％程度にまで低減する。そ
して、低温シフト反応用変成器６ｂでは１８０〜２５０
℃に加熱したＣｕ−Ｚｎ系触媒を用いており、ここでは
ＣＯ濃度を約２％から約１０００〜５０００ｐｐｍ程度
にまで低減する。もっとも、ＣＯ変成器６は必ずしも２
段階構成である必要はない。Next, the reformed city gas is supplied to the CO converter 6
Sent to The CO converter 6 has a two-stage configuration including a high-temperature shift reaction transformer 6a and a low-temperature shift reaction transformer 6b. For the high-temperature shift reaction transformer 6a, an Fe-Cr-based or Fe-Cr-Cu-based catalyst heated to 300 to 500 ° C is used as a catalyst, wherein the CO concentration is increased from 10% to about 2%. To a degree. In the transformer 6b for low-temperature shift reaction, 180 to 250
A Cu-Zn-based catalyst heated to ° C. is used, in which the CO concentration is reduced from about 2% to about 1000 to 5000 ppm. However, the CO transformer 6 is not necessarily 2
It need not be a staged configuration.
【００２５】ＣＯ濃度を低減された都市ガスは、更にＣ
Ｏ除去器７に送給される。このＣＯ除去器７に、上記し
た電解セル１より発生した湿度の高い酸素を、酸素排出
手段である配管２ｂを通して供給する。従来技術ではＣ
Ｏ除去器７に空気を供給するが、本実施形態の場合、酸
素そのものを供給するので、ＣＯ低減反応に寄与しない
窒素が含まれておらず効率的である。The city gas whose CO concentration has been reduced further contains C
It is sent to the O remover 7. The high-humidity oxygen generated from the electrolytic cell 1 is supplied to the CO remover 7 through a pipe 2b serving as an oxygen discharging means. In the prior art, C
Although air is supplied to the O remover 7, in the case of this embodiment, since oxygen itself is supplied, nitrogen which does not contribute to the CO reduction reaction is not contained, so that it is efficient.
【００２６】ＣＯ除去器７は、Ｐｔ−Ａｌ2 Ｏ3 系ある
いはＲｕ−Ｐｔ−Ａｌ2 Ｏ3 系の触媒を用いて、選択酸
化反応を起こさせることにより、ＣＯの一層の低減化を
図るようになっているが、電解セル１より発生した酸素
の存在により、ＣＯ濃度を約１０００〜５０００ｐｐｍ
から１０ｐｐｍ以下に確実に低減させる。The CO remover 7 uses a Pt-Al 2 O 3 -based or Ru-Pt-Al 2 O 3 -based catalyst to cause a selective oxidation reaction, thereby further reducing CO. However, due to the presence of oxygen generated from the electrolytic cell 1, the CO concentration is reduced to about 1000 to 5000 ppm.
To 10 ppm or less.
【００２７】以上のＣＯ低減工程を経た都市ガスは、十
分に改質されており、水分に富み湿度の高い改質ガスが
固体高分子型燃料電池Ｃに供給される。そして、固体高
分子型燃料電池Ｃにより発電された電力はインバータ８
を介して外部電源として取り出される。The city gas that has undergone the above-described CO reduction step is sufficiently reformed, and a reformed gas rich in moisture and high in humidity is supplied to the polymer electrolyte fuel cell C. The electric power generated by the polymer electrolyte fuel cell C is supplied to the inverter 8
And is taken out as an external power supply.
【００２８】〔別実施の形態〕 （１） 上記実施形態では、都市ガスを燃料ガスとする
固体高分子型燃料電池システムの例を挙げて説明した
が、本発明に係る被処理ガス改質機構と被処理ガス改質
方法は、エタノール等のアルコール、ナフサ、灯油など
を燃料ガスとする固体高分子型燃料電池システムに対し
ても適用できる。[Other Embodiments] (1) In the above embodiment, an example of a polymer electrolyte fuel cell system using city gas as a fuel gas has been described. However, the target gas reforming mechanism according to the present invention. The method for reforming the gas to be treated can also be applied to a polymer electrolyte fuel cell system using alcohol such as ethanol, naphtha, kerosene or the like as a fuel gas.
【００２９】（２） 上記実施形態では、固体高分子型
燃料電池システムの例を挙げて説明したが、本発明に係
る被処理ガス改質機構と被処理ガス改質方法は、固体高
分子型燃料電池システムのみならず、都市ガス、その他
の炭化水素ガスの脱硫、低ＣＯ処理に広く適用できる。(2) In the above embodiment, an example of the polymer electrolyte fuel cell system has been described. However, the processing target gas reforming mechanism and the processing target gas reforming method according to the present invention are not limited to the solid polymer fuel cell system. It can be widely applied not only to fuel cell systems but also to desulfurization of city gas and other hydrocarbon gases and low CO treatment.
【図１】本発明に係る固体高分子型燃料電池システムの
一実施形態を示す概略構成図FIG. 1 is a schematic configuration diagram showing one embodiment of a polymer electrolyte fuel cell system according to the present invention.
１ 電解セル ２ａ，２ｂ 排出手段 ３，４ 脱硫機構 ７ ＣＯ除去器 Ｐ 固体高分子電解質膜 DESCRIPTION OF SYMBOLS 1 Electrolysis cell 2a, 2b Discharge means 3, 4 Desulfurization mechanism 7 CO remover P Solid polymer electrolyte membrane
Claims (5)
と、この電解セルに水を供給する手段と、前記電解セル
により電解されて生成した水素および酸素を個別に排出
して被処理ガス改質ラインに供給可能な排出手段とを有
する被処理ガス改質機構。An electrolytic cell provided with a solid polymer electrolyte membrane, means for supplying water to the electrolytic cell, and hydrogen and oxygen generated by electrolysis by the electrolytic cell are individually discharged to improve the gas to be treated. A gas reforming mechanism having a discharge means capable of supplying the gas to the quality line.
処理ガス改質ラインを構成する脱硫機構に導入されるよ
うになっていると共に、前記酸素が前記被処理ガス改質
ラインを構成するＣＯ除去器に導入されるようになって
いる請求項１の被処理ガス改質機構。2. A discharge means for discharging the hydrogen is introduced into a desulfurization mechanism constituting the gas to be treated line, and the oxygen constitutes the gas to be treated line. 2. The process gas reforming mechanism according to claim 1, wherein the mechanism is introduced into a CO remover.
備える固体高分子型燃料電池システム。3. A polymer electrolyte fuel cell system comprising the target gas reforming mechanism according to claim 1.
水を供給し、この電解セルに通電して水素および酸素を
生成し、これら生成された水素および酸素を個別に排出
して被処理ガス改質ラインに供給する被処理ガス改質方
法。4. Water is supplied to an electrolytic cell provided with a solid polymer electrolyte membrane, electricity is supplied to the electrolytic cell to generate hydrogen and oxygen, and the generated hydrogen and oxygen are individually discharged to be treated. A method for reforming a gas to be treated to be supplied to a gas reforming line.
質ラインを構成する脱硫機構に導入すると共に、生成し
た前記酸素を、前記被処理ガス改質ラインを構成するＣ
Ｏ除去器に導入するようになっている請求項４の被処理
ガス改質方法。5. The generated hydrogen is introduced into a desulfurization mechanism that constitutes the processing gas reforming line, and the generated oxygen is converted into C that forms the processing gas reforming line.
5. The process gas reforming method according to claim 4, wherein the process gas is introduced into an O remover.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000141111A JP2001325981A (en) | 2000-05-15 | 2000-05-15 | Processed gas reforming mechanism, solid polymer fuel cell system, and processed gas reforming method |
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| Publication Number | Publication Date |
|---|---|
| JP2001325981A true JP2001325981A (en) | 2001-11-22 |
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ID=18648275
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Cited By (6)
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|---|---|---|---|---|
| JP2006008418A (en) * | 2004-06-22 | 2006-01-12 | Idemitsu Kosan Co Ltd | Apparatus for producing hydrogen and fuel cell system |
| JP2006517905A (en) * | 2003-02-18 | 2006-08-03 | ハイドロジェンソース エルエルシー | Hydrogen generator for hydrodesulfurization of hydrocarbon feed |
| JP2010058995A (en) * | 2008-09-01 | 2010-03-18 | Tokyo Gas Co Ltd | Hydrogenation desulfurizer-integrated cylindrical steam reformer |
| WO2010041471A1 (en) * | 2008-10-09 | 2010-04-15 | パナソニック株式会社 | Hydrogen generator, fuel cell system, and method of operating hydrogen generator |
| JP2012176897A (en) * | 2012-06-21 | 2012-09-13 | Tokyo Gas Co Ltd | Hydrogenation desulfurizer-integrated cylindrical steam reformer |
| JP2014234322A (en) * | 2013-05-31 | 2014-12-15 | 株式会社神戸製鋼所 | Hydrogen production apparatus stopping method and hydrogen production apparatus |
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2000
- 2000-05-15 JP JP2000141111A patent/JP2001325981A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006517905A (en) * | 2003-02-18 | 2006-08-03 | ハイドロジェンソース エルエルシー | Hydrogen generator for hydrodesulfurization of hydrocarbon feed |
| JP4800923B2 (en) * | 2003-02-18 | 2011-10-26 | ユーティーシー パワー コーポレイション | Hydrogen generator for hydrodesulfurization of hydrocarbon feed |
| JP2006008418A (en) * | 2004-06-22 | 2006-01-12 | Idemitsu Kosan Co Ltd | Apparatus for producing hydrogen and fuel cell system |
| JP2010058995A (en) * | 2008-09-01 | 2010-03-18 | Tokyo Gas Co Ltd | Hydrogenation desulfurizer-integrated cylindrical steam reformer |
| WO2010041471A1 (en) * | 2008-10-09 | 2010-04-15 | パナソニック株式会社 | Hydrogen generator, fuel cell system, and method of operating hydrogen generator |
| JP2012176897A (en) * | 2012-06-21 | 2012-09-13 | Tokyo Gas Co Ltd | Hydrogenation desulfurizer-integrated cylindrical steam reformer |
| JP2014234322A (en) * | 2013-05-31 | 2014-12-15 | 株式会社神戸製鋼所 | Hydrogen production apparatus stopping method and hydrogen production apparatus |
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